Electric bell.



UNITED STATES Patented November 24, 1903.

PATENT OEEIcE- PAUL G. TISMER, OF NEXV YORK, N. Y., ASSIGNOR TO THEBUNNELL TELE- GRAPHIC & ELECTRICAL COMPANY, OF NEW YORK, N. Y., ACORPORA- TION OF NEW YORK.

ELECTRIC BELL.

SPECIFICATION forming part of Letters Patent No. 744,944, dated November24,1903.

Application filed June 21, 1902. Serial No. 112,592. (No model.)

To aZZ whom it mag concern.-

Be it known that 1, PAUL G. TISMER, a subject of the German Emperor,residing at New York, in the county of New York and State of New York,have made a new and useful Invention in Electric Bells, of which thefollowing is a specification.

My invention is directed particularly to improvements in electric bellsof the vibratory to or trembler type.

For a full and clear understanding of the invention, such as will enableothers skilled in the art to construct and use the same, reference ishad to the accompanying drawings,

1: 5 in which Figure 1 illustrates in plan view a full-sized electricbell embodying the features of my invention, the covering or casing tothe operative parts, however, being removed. Fig. 2

is a side elevational'view as seen looking at Fig. 1 from left to right,the covering or casing being shown in position in this view and insection and the bell partly broken away.

- Fig. 3 is a perspective view of the frame which supports the operativeparts, the arm which supports the bell proper being shown also in thisView in dotted lines and broken off at one end. Fig. 4 is an enlargedsectional view taken through Fig. 1 on the line :1; 0c and as 0 seenlooking thereat from the bottom toward the top of the drawings, theclapper and the bell, however, not being shown in this View.

Fig. 5 is a detail elevational view of a modified means of adjustmentfor the armature 3 5 and bell-clapper lever secured thereto. Fig. 6 is adetail sectional view through the base to which the frame is secured,showing a modified means of securing the covering or casing thereto.

Referring now to the drawings in detail, in all of which like letters ofreference represent like parts wherever used, A represents the basewhich supports the entire apparatus.

F represents the supporting-frame, to which the different parts of thestructure are secured, said frame being constructed in one integralpiece, preferably of soft metal, such as brass or iron, and stamped orotherwise formed in the manner shown, so that the lower portion thereofhas a plane surface adapting it to be secured directly to the base A byrivets through rivet-holes, E being a rectangular extension to which themagnets M M are secured by screws or rivets extending throughscrew-holes H H When the supportingframe F is of brass or othernon-magnetic metal, of course the usual magnetic yoke for the magnets Mshould be secured to their ends between them and the frame.

I is an angular extension bent upward and then outward, so as toconstitute a standard or support for the armature-lever, which ispivoted to said standard in pivot-holes o o.

J is a lateral extension bent slightly upward and then on a plane withthe base of the frame, as clearly shown in Fig. 4-, said extensionacting as a support for the adjustable contact P.

G is a curved extension at the rear side of the frame provided withnotches or openings O O and a rectangular-shaped hole H at its outerend, said notches being for the purpose of adjusting the armature-leverthrough the agency of a retractile spring L, which is constructed,preferably, of one integral piece of metal bent in the manner shown inFig. l and acting to serve the unitary purpose of a support for thearmaturelever N and a flexible contact for the back contact of saidarmaturelever and also a yielding adjusting-spring, as will be describedmore particularly in connection with the description of the manner ofassembling the parts.

H is an upwardly-extending arm provided with a rectangular-shaped hookat its upper end extending inward toward the body of the frame, saidhook acting as a means for securing the covering or casing O in place inconnection with a locking-spring L, secured directly to the base by arivet, as shown in Figs. 0

1 and 2.

D is an arm or support for the bell, said arm being secured directly tothe upper side of the frame F by rivets through rivet-holes, the bell Bbeing attached to the outer end there- 5 of and directly in the path ofthe clapper carried by the armature-lever N. The arm D is madedetachable from the frame, as shown,

so that when the bell is left off the instrument becomes a buzzer.

B and B represent the binding-posts secured to lugs or extensionsintegral with one end of the base, the post B being in metallicconnection therewith and the post 13 insulated therefrom by washers W WVand both of said posts locked against turning by bending the extremeends of the lugs to which they are attached upward, as shownin Fig. 2.

Referring now to Fig. 4, I will describe in detail the manner ofsecuring the adjustable contact P directly to the frame F and in suchmanner that said contact is automatically locked after it has beenturned back or forth for the purpose of effecting adjustment between itand the movable contact carried at the free end of the spring L. Thisadjustable contact is screw-threaded, as shown, and provided with anoperating thumb-head T, having corrugated extensions, as shown. Saidcontact is secured in the upper end of an angular arm, which in turn issecured by a rivet extending through an opening K in the lateralextension J of the frame F. W W are washers similar to the like washersfor the binding-post B said washers being of insulating material, asvegetable fiber, and S is a curved spring secured above the upper washerW with its free end in yielding contact with the corrugations of thethumb-head T, 40 being a conductor running to the magnets M.

The several parts of my novel bell are assembled as follows: The angularsupport for the adjustable contact P and yielding spring S for lockingsaid contact are secured in place above the lateral extension J andinsulated therefrom. This is effected by piercing the twoinsulating-washers W W, as vegetable fiber, by a pointed instrument, sothat the indented portions thereof when placed in position will faceeach other, as shown. A rivet is then secured in place with the shankthereof in the opening through the washers, its upward end extendingthrough a hole in the spring S and a corresponding hole in therectangular standard with the end of the conductor 40 between the parts,after which all of the parts are securely riveted together. The act ofthus riveting the parts together causes the washer and theoutwardly-extending portion of the spring S to be bent upward by thelateral extension J, so that all of the parts are effectually lockedtogether. The spring S is then turned over the top of the rivet in themanner shown, so as to act as a lock for the thumb-head T. Thebell-support D is then secured to the frame F by rivets and the bell 13attached thereto at the outer upturned end thereof. The frame F is thensecured directly to the base A by rivets orin any preferred manner andthe magnets M M are secured to the rectangular extension E by insertingscrews through the holes H H Lugs or ears are stamped through theenlarged part of the spring L, so as to constitute a means of attachmentfor the pivot-pin. The spring L is then bent into the conformation shownin Fig. 1, and the armature-lever N and its attached clapper are thensecured to this spring by rivets, as shown in Fig. 2. These parts arethen placed in position with the ends of the pivot-pin restingin thepivotbearing 0 o of the extension I. The adjustable contact P is thenput in place by rotating the thumb-head T to the desired point, thespring S locking it after each movement of the outer corrugationsthereof. The free end of the adjustable spring L of the armature-leveris then lifted and locked in position in one of the locking-openings 0,de-

pendent upon the nature'of the adjustment required. The necessaryconnections are made between the magnets M and the hind ing-posts B Bsecured to the base, in the manner above indicated, the binding-post Bbeing insulated from the base by washers W W in the same manner that theinsulation was effected for the adjustable contaclLP. The cover is nowslipped into position with an opening in one end thereof passing overthe extension or hook H, the yielding lockingspring L falling intolocking position in a depression or opening in the other end of saidcasing when it is lowered into contact with the base. The bell is nowready for operation and may be connected up in circuit in the usualmanner.

In Fig. 5 I have illustrated in detail a modified means of adjustmentfor the armaturelever. In this instance the curved spring L is replacedby a spiral spring of the usual form secured to a rectangular-shaped pinscrew-threaded, as shown, and adapted to fit through a rectangularopening H in the extension G, V being a nut for regulating theadjustment as desired, said nut resting against a shoulder formed by abend in the extension G to prevent it from turning, or it may restagainst a projection or indentation.

In Fig. 6 I have shown a modified means of securing the casing Gdirectly to the base A. In this instance the casing is provided with adownwardly-extending portion of the cover C or alocking-spring L, whichis adapted to be locked directly to the base by a wall of an openingthrough which it extends.

I do not limit all the features of my invention to use in connectionwith electric bells, as notably a number thereof might be used inconnection with electric translating devices generallysuch, forinstance, as relays and sounders-or in places where bindingposts andadjust1nent-springs or adjustable contacts are used.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is

1. A frame or support for the parts of an electric bell constructed ofone integral piece of metal F having an angular extension E for themagnet, an angular extension I for the bell-clapper, and a curvedextension G and a lateral extension J for the adjustable 10 curedthereto; in combination with a series of locking-notches for varying theadjustment of the yielding spring, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of [5 two subscribing witnesses.

PAUL G. TISMER. Witnesses:

O. J. KINTNER, ,M. F. KEATING.

